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The two upstream oxygen sensors are smaller in diameter than the two downstream sensors, right? I checked, and my front sensors are small and my back ones, one is large and one is small like the front ones. I think the shop that replaced my oxygen sensor put an upstream one in the back and then cleared the code. I think this may be the reason my SES light has come on since the sensors are not interchangeable.
 

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Go to Autozone and have the codes checked. They'll be abel to tell you what code you have. After you get that, post it here, and someone will be able to help you. The O2 sensors are not interchangable, though.

JR
 
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